Stencil sheet



Patented Oct. 11, 1927.

UNITED STATES SHINJ'IRO HORII, F TOKYO, JAPAN.

STENCIL SHEET.

Ho Drawing.

This invention relates to improvements in stencil sheets of the typecommonly used for autographic and typewriting duplication, consisting ofa sheet of fibrous material coated or impregnated with a coatingcomposition including esters of polysaccharides and chlorinatednaphthalene.

The object of the present invention is to provide an improved stencilsheet, adapted for stencilization by pressure, which offers aconsiderably great resistance to the atmospheric influence on using orstoring and gives a large number of clear and sharp copies.

In carrying out the invention, 'a base of open porous material, such asyoshino paper,

is coated or impregnated with a coating composition including esters ofpolysaccharides, such as mannan acetate, cellulose acetate and cellulosenitrate, and chlorinated naphthalene in solution together with orwithout a tempering agent such as oils, fats, fatty ac1ds and Waxes. Thecoating operation is carried out in the usual manner.

The proportions of the ingredients of the composition may vary accordingto several circumstances, an example being as follows Parts by weight.

Cellulose nitrate, 5% solution 100 Chlorinated naphthalene 2O Stearine 5Castor oil 5 Application filed May 18,

1926. Serial No. 109,974.

esters of polysaccharides, but also a mixture of them.

According to the present invention, on using the coating composition nothitherto 4o employed for the same purpose, the coated sheet ispractically permanent for an extended period of time and producesthereon a clear writing by the pressure' of a hand stylus or the blow ofa writing machine, givmg a large number of copies when the sheet is usedin the ordina manner, i. e. in a stencil-duplicating mac ine.

What I claim is 1. As a new article of manufacture, a stenoil sheet madeof a base of fibrous material, and an impregnating compositioncomprisingesters of polysaccharides and chlorinated naphthalene.

2. As a new article of manufacture, a sten- 55 cil sheetmade of a baseof fibrous material, and an impregnating composition comprising estersof olysaccharides, chlorinated naphthalene and a tempering agent.

3. As a new article of manufacture, a stene0 cil sheet made of a base offibrous material, and an impregnating composition comprising thefollowing ingredients:

Parts by weight. Cellulose nitrate, 5% solution .5 Chlorinatednaphthalene 20 Mannan acetate, 10% solution 20 Stearine 5 Castor oil 5In testimony whereof I aflix my signature.

SHINJIRO HORII.

